INT0中断 3位计数器 PROTEUS 和51单片机教程（附仿真文件+源代码）

INT0中断 3位计数器 PROTEUS 和51单片机

程序C源代码 如下：

/*
INT0中断计数
*/
#include <reg51.h>
typedef unsigned char uint8;
typedef unsigned int uint16;

sbit K2 = P3^5;

void delay(uint16 x)
{
uint16 i,j;
for(i = x; i > 0; i --)
for(j = 114; j > 0; j --);
}

code uint8 LED_CODE[] = {0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0xFF};

uint8 Buffer_Counts[]={0,0,0};

uint16 Count=0;

void Show_Counts()
{
uint8 i;
Buffer_Counts[2] = Count / 100;
Buffer_Counts[1] = Count % 100 /10;
Buffer_Counts[0] = Count % 10;
if(Buffer_Counts[2] == 0)
{
Buffer_Counts[2] = 10;
if(Buffer_Counts[1] == 0) Buffer_Counts[1] = 10;
}
for(i = 0;i < 3;i ++)
{
P0 = 0xFF;
P2 = 0x80 >> i;
P0 = LED_CODE[Buffer_Counts[i]];
delay(2);
}
}

void main()
{
IP = 0x01;
IT0 = 1;
IE = 0x81;
while(1)
{
if(K2 == 0) Count = 0;
Show_Counts();
}
}

void ISR0() interrupt 0
{
Count++;
}